Improvement in drying-kilns



2'Sh-aets-Sheet2l G. T. WEIGELIN.

Drying-kilns. No 147 718. V Patentedfebnman.

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UNITED STATES- PATNT FFIoE.

G'USTAV I. VVEIGELIN, OF FRANFORT, GERMANY.

lMRovEMENT IN oRvlNe-KILNS.

Specification forming part of Letters PatentrNo. 147,71 S, dated February 17, 1874; application filed June 11,1873.

To all whom it may concern:

Be it known that I, GUsTAv I. WEIGELIN, of Frankfort, Empire of Germany, have invented a new and useful Improvement in Drying-Kilns; and I do hereby declare the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification, in which drawing- Figure l is a vertical central section of this kiln. Fig. 2 is a horizontal section of the same. Fig. 3 is a sectional top view thereof. Fig. 4 is a transverse section in the plane a' w, Fig. l. Fig. 5 is a similar section in the plane y y, Fia 1 Similar letters indicate correspondin g parts.

This invention relates to a kiln for drying and evaporating the moisture from earthen- Ware, bricks, glue, Wood, peat, starch, linen, Wool, and other articles, by means ofthe radiating heat of a hot-air pipe, which is placed beneath the floor of the drying-room, and by these means the articles in said room are uniformly heated and dried, and the vapors and gases which are emitted bythe articles during the drying process are driven off through a discharge-pipe by ventilating the drying-chamber. My inventioil consists in the arrangement of a heating-pipe beneath the skeleton iioor or false bottom ofthe heating or drying chamber, said pipe being connected with the 11eating-furnace,\vhich is situated at one end of said drying-chamber-in such a manner that the radiating'heat of said pipe will uniformly warm and penetrate the articles during the drying process. It consists, further, in the arrangement of a branch pipe projecting from said heating-pipe and serving to connect said pipe with the air-space of the furnace in the next succeeding chamber in such a manner that the heat discharging from 011e dryingchamber Will serve to increase the heat in the next chamber. It consists, further, in the arrangement of ventilating ilues or tubes in the top or roof of the drying-chamber,which ues. are connected With the heating-furnace, and pass the heated air into the drying-chamber, which serves to ventilate said chamber in such a manner that the steamor gases generated therein are carried off through the dischargepipe. This invention consists, further, in the arrangement of a discharge-pipe or ilue in the roof of the drying-chamber,which flue is connected with the smoke-due or chimney of the kiln. The kiln is constructed with a corridor or passage through it, on opposite sides of which are situated the drying-chambers, which are provided each with a separate furnace that is accessible from said corridor.

In the drawing, the letter A designates the drying-chamber, which is hermetically sealed, and which is situated on one side of a corridor, B, on the opposite side Iof Which is a similar chamber, A. Beneath the floor of the corridor B is formed a smoke-flue, C. In said drying-chambers are placed detachable false bottoms D D,Which are composed damper, b. In order to utilize and consume' all the produced heat, the arrangement has been so made that, instead of passing off at once into the smoke-Hue, the heated air Will enter, by means `of a branch-pipe, H, Fig. 2,

into the air-space N of the furnace in a second chamber, and from herein a third, and so on, the air-space N being provided with a cover or damper, o, Fig. 1, to open or close the communication. Over the tire-place of the furnace is an iron arch, d, (best seen in Fig. 4,) above which there is a hollow space, d', that communicates on one side With an air channel or passage, @,Which leads out into the corridor B, having a door, j', by means of which it can be closed, and on the opposite side said hollow space communicates With a tube, l, which, passing through the arched top or ceiling of the chamber A and branching off in Van opposite transverse direction, as at g g, Fig. 3, leads into flues J J, Which serve to ventilate the drying-chamber, being provided with perforations 7l h, (see Fig. 5,) said ventilatingilues being situated en opposite sides in the top of the drying-chamber. In the roof of the drying-chamber is situated the discharge-pipe or iiue K, which has a number of perforations, 'i fi, and which discharges into a iiue, L, Fig. 1, that leads downward to the s1noke.fiue, the discharge being closed, if desired, by means of a conical valve or damper, j- The fresh air entering the air-channel c is heated in passing through the hollow space d by the radiating heat of the iron arch d. The air thus heated enters the drying-chamber through the perforations 71l h in the Ventilating-flue J, and it evacuates by means of the perforations i yi in the discharge-flue K, and, in order to insure a uniform supply and discharge of the het air, the size of the perterations yaries with their distance from the openings in the ues. A thermometer is placed in the drying-chamber, visible from the corridor B, so that the temperature of said chamber can be ascertained and regulated at all times.

The articles to be dried are brought -in through the door M, and are stacked on the tleor D. The discharge of air from the drying-chamber is then stopped by closing the damper j. Then the ventilation of the chamber is stopped by closing the air-channel e, thereby cutting off the supply ot' air. rIhe door M is made hollow, and is iilled with sand or other suitable material, so as to render it perfectly airtight, and, said door having been closed, the fire is lighted in the furnace E, the products entering the serpentine heating-pipe F, as already stated. The heat radiating from said pipe then gradually warms the articles on the iioor I), and consequently the moisture contained in them evaporates, and not being allowed to escape, the steam in' the chamber acquires a certain degree of tension. By these means a chief requirement is attained for drying in a rational manner, the articles being uniformly warmed, Which can only take place in a room containing steam under pressure.

As soon as the temperature of the chamber has attained the necessary degree for drying, which can be ascertained by means of the thermometer, the discharge Valve or damper j is opened. The chamber is then ventilated by opening the air-channel c, and the vapors and gases generated will rush out through the discharge-flue, and thereby they are prevented from becoming condensed in the dryingchamber.

VVhat I claim as new, and desire to secure by Letters Patent, is

l. The heating-pipe F, arranged beneath the perforated false bottom D and communieating with the furnace E, through the open` ing a, in combination With the Valve b and iiue C, all constructed and arranged substantially as and for the purpose specified.

2. The heating-pipe F, provided With the branch. pipes I'I for connecting With the airspaces N of the next succeeding furnace, for the purpose speciiied,in combination with the valve band flue C, substantially -as herein shown and described.

3. 'Ihe Ventilating-fines J. in the top of the drying-chamber, in combination With the iuc I, having the branching tubes g g, and with the heating-furnace E, substantially as and for the purpose specified.

4. The furnace E, pipe I, iiues J, perforated iiue K, and flue' L, in colnbination with the heating-pipe F and chamber A, all constructed and arranged substantially as and for the purpose specified.

5. rlhc furnace-arch d, space d', ail-passage c, and iiue I, having the branch tubes g g, in combination with the perforated Ventilatingflucs J, drying-chamber A, and pipe F, substantially as described.

(i. The duplex drying-chambers A A, separated by a corridor, B, and each provided .with a heating-pipe, F, and Ventilating-pipes J J, combined substantially as described, the heating-pipe of one chamber communicating with the air-space N of the furnace Ein thev opposite chamber, as and for the purpose specified.

G USTA'V l. WEIGELIN.

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